User`s manual

U.S. Robotics I-modem Command Reference
Analog Synchronous Applications • Page 16-11
Result Codes
These are the normal (X0) result codes.
> (Greater Than) separator
< Pause
= (Equal Sign) separator
P Pulse
T Tone
. (Period) separator
- (Minus) separator
CFI Call failed
CFRT Ringing
CNX Connect
INC Incoming call
INV Invalid action
LS List of numbers
LSF List of forbidden numbers